CLASS MONOGENEA

Monogeneans are usually ectoparasites on the skin and gills of fish. The mouth may be equipped with a sucker. Monogeneans also have a posterior attachment organ armed with suckers and hooks called a haptor. The life cycle involves only one host, for the adult. New hosts are located and infected by free-living larvae.

Clockwise from top left :

Monopisthocotylea entobdellae from a sole, Polyopisthocotylea polystoma from a frog, Gyrodactylus sp., Diplozoon paradoxum from fish.